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What are the original coordinate systems (CS) of your data frames and layers? What is the CS that everything is being changed to? Is it changing the layer CS or the data frame CS?
This may be a very isolated case. It would be best to submit an incident with Tech Support so we can address this ASAP.
It is changing the data frame CS. The original CS is a project based system provided by our surveyors (PMRail GRS80). In essence, it's WGS 84, but corrected for our project area which runs approximately 35 miles long. The new CS it changes it to is RT90_25_gon_W. I have only added layers with the project CS, or WGS 84. I have never seen the new CS, have no layers associated with it, and am completely baffled as to where it came from. It changes the CS when I refresh DDP, or try to scroll pages. Seems to only be affected by DDP, but again, I have had no problem with it until now and if I open older maps with DDP (for this same project area), it happens on those now too.
Thanks for your thoughts.